/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.aop.support;

import java.io.Serializable;

import org.springframework.aop.ClassFilter;
import org.springframework.util.Assert;

/**
 * Simple ClassFilter implementation that passes classes (and optionally subclasses).
 *
 * @author Rod Johnson
 * @author Sam Brannen
 */
@SuppressWarnings("serial")
public class RootClassFilter implements ClassFilter, Serializable {

    private final Class<?> clazz;


    public RootClassFilter(Class<?> clazz) {
        Assert.notNull(clazz, "Class must not be null");
        this.clazz = clazz;
    }


    @Override
    public boolean matches(Class<?> candidate) {
        return this.clazz.isAssignableFrom(candidate);
    }

    @Override
    public boolean equals(Object other) {
        return (this == other || (other instanceof RootClassFilter &&
                this.clazz.equals(((RootClassFilter) other).clazz)));
    }

    @Override
    public int hashCode() {
        return this.clazz.hashCode();
    }

    @Override
    public String toString() {
        return getClass().getName() + ": " + this.clazz.getName();
    }

}
